Even after rising 14% this past week, Westport Fuel Systems (TSE:WPRT) shareholders are still down 88% over the past three years

Westport Fuel Systems Inc. (TSE:WPRT) shareholders should be happy to see the share price up 21% in the last month. But only the myopic could ignore the astounding decline over three years. To wit, the share price sky-dived 88% in that time. So it's about time shareholders saw some gains. Of course the real question is whether the business can sustain a turnaround. We really hope anyone holding through that price crash has a diversified portfolio. Even when you lose money, you don't have to lose the lesson.

On a more encouraging note the company has added CA$18m to its market cap in just the last 7 days, so let's see if we can determine what's driven the three-year loss for shareholders.

View our latest analysis for Westport Fuel Systems

Because Westport Fuel Systems made a loss in the last twelve months, we think the market is probably more focussed on revenue and revenue growth, at least for now. Generally speaking, companies without profits are expected to grow revenue every year, and at a good clip. That's because it's hard to be confident a company will be sustainable if revenue growth is negligible, and it never makes a profit.

In the last three years, Westport Fuel Systems saw its revenue grow by 4.0% per year, compound. Given it's losing money in pursuit of growth, we are not really impressed with that. Nonetheless, it's fair to say the rapidly declining share price (down 23%, compound, over three years) suggests the market is very disappointed with this level of growth. While we're definitely wary of the stock, after that kind of performance, it could be an over-reaction. Before considering a purchase, take a look at the losses the company is racking up.

The image below shows how earnings and revenue have tracked over time (if you click on the image you can see greater detail).

You can see how its balance sheet has strengthened (or weakened) over time in this free interactive graphic.

A Different Perspective

While the broader market gained around 14% in the last year, Westport Fuel Systems shareholders lost 10.0%. Even the share prices of good stocks drop sometimes, but we want to see improvements in the fundamental metrics of a business, before getting too interested. Unfortunately, longer term shareholders are suffering worse, given the loss of 12% doled out over the last five years. We would want clear information suggesting the company will grow, before taking the view that the share price will stabilize. I find it very interesting to look at share price over the long term as a proxy for business performance. But to truly gain insight, we need to consider other information, too. For instance, we've identified 2 warning signs for Westport Fuel Systems that you should be aware of.

But note: Westport Fuel Systems may not be the best stock to buy. So take a peek at this free list of interesting companies with past earnings growth (and further growth forecast).

Please note, the market returns quoted in this article reflect the market weighted average returns of stocks that currently trade on Canadian exchanges.

Have feedback on this article? Concerned about the content? Get in touch with us directly. Alternatively, email editorial-team (at) simplywallst.com.

This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.